Trophonios

(Greek), Latin, Trophonius. He has visited the cave of
Trophonius (Greek). Said of a melancholy man. The cave of
Trophonius was one of the most celebrated oracles of Greece. The
entrance was so narrow that he who went to consult the oracle had to
lie on his back with his feet towards the cave, whereupon he was caught
by some unseen force and violently pulled inside the cave. After
remaining there a time, he was driven out in similar fashion, and
looked most ghastly pale and terrified; hence the proverb.